Which celebrity makes Josh Hartnett starstruck?

Since breaking into Hollywood as a teen, Josh Hartnett has shared the screen with A-listers like Kirsten Dunst, Ben Affleck, Harrison Ford, Jessica Alba, Scarlett Johansson and Morgan Freeman.

Still, the Penny Dreadful star insists he’s never felt intimidated by a fellow actor — besides comedian Ricky Gervais.

“I was just on a show with Ricky Gervais, and I’m a little unsure how to approach him. I met him before, but I couldn’t even say hi today,” Hartnett said Wednesday on Wake Up with Taylor after seeing the comic backstage at Live! with Kelly and Michael. “It is funny, though, because with most actors, you’re playing characters, and I know it’s not them up there. And when you meet an actor, they’re focused on what they’re doing. I don’t know, I’ve never found that intimidating. But Ricky Gervais, a little bit.”

(By the way, after all the Live! drama, Hartnett said the co-hosts’ “vibe was good” on set.)

As for his hunky reputation, Hartnett said he’s learned to appreciate topping magazine’s hot lists with time.

“I’m 37 years old now, and actually being considered a heartthrob is kind of nice,” he said. “I’ll take it now!”

Wake Up with Taylor airs weekdays at 7 am ET on SiriusXM Stars (Ch. 109), and watch Penny Dreadful’s season premiere Sunday at 10 pm ET on Showtime.

For a free 30-day trial, check out http://www.siriusxm.com/freeTrial.